I just updated almost all projects to work with Lion and Xcode 4.
Apart from updating the project files I also fixed some memory management bugs, some syntactic issues with the static analyzer and a few logic errors.
In some cases I also made changes to the API. So in case you use any of these projects, I recommend downloading the new versions and adapting your code.

Updated AMRollOverButton to work with Lion.
Since Xcode 4.x does not support IB plugins I needed to come up with another way to integrate AMRollOverButtons into my projects. See the readme included with the project for more details.